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CVE-2026-105741

HIGH 7.1

Published 2026-10-05 · Last modified 2026-10-06

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.5.0 until 1.10.3, an IP spoofing vulnerability in the Model Context Protocol (MCP) configuration installation endpoint (POST /api/v1/mcp/project/{project_id}/install) allowed authenticated remote attackers to bypass the "local-only" access restriction. By sending a spoofed X-Forwarded-For: 127.0.0.1 header, an attacker could make the server treat the request as originating from localhost, letting them write/overwrite an MCP client configuration file on the server's filesystem. This vulnerability is fixed in 1.10.3.

ELEVATED IMPACT

Severe if exploited (CVSS 7.1), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 15th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.1CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityHigh
  • AvailabilityLow

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Langflow Ai

Products Langflow

Weakness (CWE)

  • CWE-290: : Authentication Bypass by Spoofing
  • CWE-345: : Insufficient Verification of Data Authenticity

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • langflow PyPI

    pkg:pypi/langflow

    ECOSYSTEM range
    • Introduced version (included): 1.5.0
    • Fixed boundary (excluded): 1.10.3
    48 explicitly listed affected versions

    1.10.0, 1.10.0rc0, 1.10.1, 1.10.1rc0, 1.10.1rc3, 1.10.2, 1.10.2rc4, 1.10.3rc0, 1.5.0, 1.5.0.post1, 1.5.0.post2, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.8, 1.6.9, 1.7.0, 1.7.1, 1.7.2, 1.7.3, 1.8.0, 1.8.0rc0, 1.8.0rc1, 1.8.0rc2, 1.8.0rc3, 1.8.0rc4, 1.8.0rc5, 1.8.0rc6, 1.8.1, 1.8.2, 1.8.3, 1.8.3rc0, 1.8.4, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.9.3rc0, 1.9.4, 1.9.5, 1.9.6, 1.9.6rc0

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4f6c-2vvp-gw82/GHSA-4f6c-2vvp-gw82.json"
  }
}
    GitHub Advisory Database · GHSA-4f6c-2vvp-gw82 · Updated 2026-10-15T14:56:06.869692666Z
  • langflow PyPI

    pkg:pypi/langflow

    ECOSYSTEM range
    • Introduced version (included): 1.5.0
    • Fixed boundary (excluded): 1.10.3
    48 explicitly listed affected versions

    1.10.0, 1.10.0rc0, 1.10.1, 1.10.1rc0, 1.10.1rc3, 1.10.2, 1.10.2rc4, 1.10.3rc0, 1.5.0, 1.5.0.post1, 1.5.0.post2, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5, 1.6.6, 1.6.7, 1.6.8, 1.6.9, 1.7.0, 1.7.1, 1.7.2, 1.7.3, 1.8.0, 1.8.0rc0, 1.8.0rc1, 1.8.0rc2, 1.8.0rc3, 1.8.0rc4, 1.8.0rc5, 1.8.0rc6, 1.8.1, 1.8.2, 1.8.3, 1.8.3rc0, 1.8.4, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.9.3rc0, 1.9.4, 1.9.5, 1.9.6, 1.9.6rc0

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2026-4229.yaml"
  }
}
    PyPA · PYSEC-2026-4229 · Updated 2026-10-15T14:45:07.350041709Z

All CVSS metrics

  • HIGH 7.1 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
  • HIGH 7.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

Exploit-tagged references (not proof of a PoC)

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS